Table 4 Assignment of variables and results of multicollinearity diagnosis in multifactorial binary logistic regression analysis

Smoothness of duct wall

0 = smooth;1 = thickened/rough

1.65

Ductal continuity

0 = continuous;1 = interrupted

2.44

Nodular growth direction

0 = paralleled;1 = longitudinal

1.54

Nodule-duct boundary

0 = clear;1 = blurred

2.17

Nodule shape

0 = irregular;1 = regular

1.68

Peak intensity

0 = hypo-enhancement;

1 = iso-enhancement;2 = hyper-enhancement

1.23

Vascularity signs

0 = absent;1 = present

1.60

Perfusion defects

0 = absent;1 = present

1.73

Enhancement scope

0 = not enlarged;1 = enlarged

2.86